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Need help adding to our Mackie system!

jacobrownoly

jacobrownoly

Jun 16, 2007
257
32
#1
Hi, looking for some advice on adding two HK active bass bins to our Mackie system.

At the minute we have 2 Mackie SRM450s and 1 Mackie SRM1801 (18 inch sub) connected to a Mackie CFX-12 mixer. We run the system as Mackie states with the build in crossover.

We have the chance of getting 2 HK actor active 15 inch bass bins for a very good price and I really need some advice on how to connect the whole system up, ideal we want to use all 3 subs and the 2 Mackie mains.

My first idea was to run the system how we were (as Mackie states) then just add the 2 HK subs from the 75hz sub output on the desk, but I realised that we would really want more low mid in the HKs as 75hz and below is very low. Ideally we want the mains (12 inch) for highs and high mids/low mids, the HKs (15 inch) for low mids and lows and the 18 inch Mackie sub for lows and extreme lows, hope this makes sense :hiding:

My second idea was to run the Mackies as we were and run the HK's from AUX 1, using AUX 2 for Monitors. Would this be the best way??

Really I am just after advice on the best way to run the whole system. Hope this all makes sense, many thanks! :hyper:

Jack
 
#2
you would need a 3 way crossover.
you'd get some overlapping frequencies with the 15's and 18's, it might sound ok, might also sound like a mess with comb filtering problems.
I'd do just the 15's and leave the 18 out of the picture, or, I would forget about the 15's and look for a second matching 18.
a second Mackie 18 would be waaaaay better.
 
#4
jacobrownoly said:
OK I have seen some photos of the HK active AT 115 subs, it looks like we would be able to link them up to the Mackies but would the 125HZ low filter crossover still be applied??
Click to expand...

You can link them using the full range out of the SRM 1801 but it doesn't matter what you send to the HK's - they have an internal crossover set at 110 hz - so there's no way to set "the HKs (15 inch) for low mids and lows".
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Even a 3-way crossover isn't going to make any difference - the SRM 1801 will only do 125 hz and below and the HK's will only do 110 hz and below - no way around it.
Taurus1 is correct that it may sound OK, it may sound like crap. No way to know without just hooking them up, and it will vary from room to room too. I agree that a better plan would be to get another matching Mackie SRM 1801.
 

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